Patty nods her head and accepts the deal. She knows she should be more wary of the potential side effects of drinking a second bottle of the potion while the effects from the first one are still active, but she's too horny to care about that right now.
Luke hands her the bottle, and she drinks it without hesitation.
The first and most obvious effect is the fur. As soon as she finishes drinking the potion, a thick coat of luxurious chocolatey brown fur starts growing from her, with the only exceptions being her fingers, which as her hands changed to be more pawlike were instead covered with a more light tan color, matched by the fluff pouch growing around her chin.
"Aww, that's adorable, you got like a built in scarf too." Luke says, prompting Patty to turn to him and realize that she was also getting shorter. Luke's changes didn't affect his height, so they should've been about the same still, but now he was at least half a foot taller than her.
With the last couple changes coming in, her heels raised off the ground, and her face readjusted into a cute little snout. She had gone from a bunny girl to a straight up anthropomorphic rabbit.
"You're even more adorable than before! And your fur is so soft!" Luke exclaims, accidentally almost shouting. "Well, a deal's a deal. You drank the extra potion, so now I'll fuck you as long as you want."
He had hardly finished the sentence before the bunny girl's mouth was on his cock, licking it all over before taking it all the way in. Luke had never experienced sex having a penis before, which combined with Patty's eagerness to make him unable to hold back from coming for more than 15 seconds, despite his best efforts. Then she took her mouth away, and turned around, raising her butt up to present Luke with his choice of the holes down there. With the scent of her heat filling his nose, he decided to give her some oral service in return before fully taking her. Being a woman himself most of the time, he gave the newly formed woman a purely blissful experience, stopping when she was right on the edge of her orgasm so he could give it to her when he gave her the dick she wanted so much.
Hardly 5 seconds after he stuck it in, she was coming, and his unfamiliarity with his new member made that enough to make him cum too, right inside of her.
They kept at it for hours, before finally passing out at 2am. But when they woke up, they found that